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Title: Investigation of Vacuum Insulator Surface Dielectric Strength with Nanosecond Pulses

Abstract

The maximum vacuum insulator surface dielectric strength determines the acceleration electric field gradient possible in a short pulse accelerator. Previous work has indicated that higher electric field strengths along the insulator-vacuum interface might be obtained as the pulse duration is decreased. In this work, a 250 kV, single ns wide impulse source was applied to small diameter, segmented insulators samples in a vacuum to evaluate the multi-layer surface dielectric strength of the sample construction. Resonances in the low inductance test geometry were used to obtain unipolar, pulsed electric fields in excess of 100 MV/m on the insulator surface. The sample construction, experimental arrangement and experimental results are presented for the initial data in this work. Modeling of the multi-layer structure is discussed and methods of improving insulator surface dielectric strength in a vacuum are proposed.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
15005840
Report Number(s):
UCRL-JC-151647
TRN: US0400213
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Journal Volume: 1; Conference: 2003 Pulsed Power Conference, Dallas, TX (US), 06/15/2003--06/18/2003; Other Information: PBD: 3 Jun 2003
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; ACCELERATION; CONSTRUCTION; DIELECTRIC MATERIALS; ELECTRIC FIELDS; GEOMETRY; INDUCTANCE; SIMULATION

Citation Formats

Nunnally, W C, Krogh, M, Williams, C, Trimble, D, Sampayan, S, and Caporaso, G. Investigation of Vacuum Insulator Surface Dielectric Strength with Nanosecond Pulses. United States: N. p., 2003. Web. doi:10.1109/PPC.2003.1277715.
Nunnally, W C, Krogh, M, Williams, C, Trimble, D, Sampayan, S, & Caporaso, G. Investigation of Vacuum Insulator Surface Dielectric Strength with Nanosecond Pulses. United States. doi:10.1109/PPC.2003.1277715.
Nunnally, W C, Krogh, M, Williams, C, Trimble, D, Sampayan, S, and Caporaso, G. Tue . "Investigation of Vacuum Insulator Surface Dielectric Strength with Nanosecond Pulses". United States. doi:10.1109/PPC.2003.1277715. https://www.osti.gov/servlets/purl/15005840.
@article{osti_15005840,
title = {Investigation of Vacuum Insulator Surface Dielectric Strength with Nanosecond Pulses},
author = {Nunnally, W C and Krogh, M and Williams, C and Trimble, D and Sampayan, S and Caporaso, G},
abstractNote = {The maximum vacuum insulator surface dielectric strength determines the acceleration electric field gradient possible in a short pulse accelerator. Previous work has indicated that higher electric field strengths along the insulator-vacuum interface might be obtained as the pulse duration is decreased. In this work, a 250 kV, single ns wide impulse source was applied to small diameter, segmented insulators samples in a vacuum to evaluate the multi-layer surface dielectric strength of the sample construction. Resonances in the low inductance test geometry were used to obtain unipolar, pulsed electric fields in excess of 100 MV/m on the insulator surface. The sample construction, experimental arrangement and experimental results are presented for the initial data in this work. Modeling of the multi-layer structure is discussed and methods of improving insulator surface dielectric strength in a vacuum are proposed.},
doi = {10.1109/PPC.2003.1277715},
journal = {},
number = ,
volume = 1,
place = {United States},
year = {Tue Jun 03 00:00:00 EDT 2003},
month = {Tue Jun 03 00:00:00 EDT 2003}
}

Conference:
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